c++如何使用Boost.Asio实现高性能网络库_c++异步IO模型实战

#include <boost/asio.hpp>
#include <memory>
#include <iostream>

using boost::asio::ip::tcp;

class Session : public std::enable_shared_from_this<Session> {
public:
    Session(tcp::socket socket) : socket_(std::move(socket)) {}

    void start() {
        do_read();
    }

private:
    void do_read() {
        auto self = shared_from_this();
        socket_.async_read_some(
            boost::asio::buffer(data_, max_length),
            [this, self](const boost::system::error_code& error, size_t length) {
                if (!error) {
                    do_write(length);
                }
            });
    }

    void do_write(size_t length) {
        auto self = shared_from_this();
        boost::asio::async_write(
            socket_,
            boost::asio::buffer(data_, length),
            [this, self](const boost::system::error_code& error, size_t /*length*/) {
                if (!error) {
                    do_read(); // 继续读取
                }
            });
    }

    tcp::socket socket_;
    enum { max_length = 1024 };
    char data_[max_length];
};

class Server {
public:
    Server(boost::asio::io_context& io_context, short port)
        : acceptor_(io_context, tcp::endpoint(tcp::v4(), port)) {
        do_accept();
    }

private:
    void do_accept() {
        acceptor_.async_accept(
            [this](const boost::system::error_code& error, tcp::socket socket) {
                if (!error) {
                    std::make_shared<Session>(std::move(socket))->start();
                }
                do_accept(); // 继续接受新连接
            });
    }

    tcp::acceptor acceptor_;
};

int main() {
    try {
        boost::asio::io_context io_context;
        Server server(io_context, 8080);
        io_context.run(); // 启动事件循环
    } catch (std::exception& e) {
        std::cerr << "Exception: " << e.what() << "\n";
    }
    return 0;
}